Victoria; I am a 77 yr young retired EE, registered professional, and have taken up the study of making CS as a hobby, I have my own spectrophometer. In fact in the last month I have made over 50 ppm measurement on evaluating polarity switching. (actually to date over 200)
My studies, all charted and plotted, range from 12, to 380 Vdc plus 480 ac with spacing from .8" to 2" I started out with a Radio Shack relay and it failed in a week or two. My EZCS unit that I sell for $60.00 has a 555 timer, 4027 f/f, and an L293D driver. It has a 120/24 vac wall mounted xfrmr. The unit isd 4" dia by 2" tall and sits on top of 16 oz. SOLO beverage cup (grocery store item). The unit I referred to in the post you are quoting is for a Y2K battery job. There appears to be as hi rel relay that should wotk for maybe 100,000 cycles. I have posted the circuit diagram that I am using. I think that I left of the 35 vdc on pin 8 of the L293D. It is attached for your use. As you peruse this list you will find more baloney than you could imagine. My job hs been to stir the pot and get people to stop the simple battery device and them wonder where they are and what has happened to their CS. Some of the baloney is; boil the water (if you want to boil do it in a vacuum chamber as I have done to remove the adsorbed gases. It makes very little difference with 36 v, but it does effect the process from 180 vdc and up. Another "old wives tale" is use brown or blue bottles and store in the dark. I like the 16 oz clear coke bottle as the five little feet are excellent collectors if the CS should dropout. My samples are in the room light and about 8 feet from a 100 watt light. Then the subject of refrigeration. It will destroy the yellow CS as will freezing, but the clear CS is unaffected. Can't use plastic of the type used in milk bottles it causes the CS to plaste-out on the walls. There has been much discussion on the merits of the "starved electorde" operation in the brewing of CS. I believe that the parameters I am using fall into that category. I haven't had time to run the calcs. I use 1" spacing with 3-1/2" of #14 gage silver in the DW. I have settled on basically a 60 X 60 switch pluse. Shorter times length the brew time, Longer times shorten the brew time, but there comes a trade-off on sludge in the bottom of the brew cup. With DW that has 1- 3 microSmiens of conductivity. Generally 500 k ohms to 250k as measured with a one centimeter conductivity probe. At present the measurements are made with dc but a 800 hz to 1 khz ohmmeter would be much better. Others do not get any consistency, but the polarity reversal seems to wrap up all of the dangling ends into a small package. A friend of mine has suggested a microprosecc, but why fiddle with it except for ego's sake. If you will send me you esnail mail address I will send you enough charts to give you a better undstanding of what is gping on in the process. If you don't have a spectrophotometer you better consider Hanna's $150.00 single freq. unit. If you have more questions fire away. Robert Victoria Welch wrote: > [email protected] wrote: > > > > Hi Ya'All, > > > > It's pot stirring time again. > > > > The day of predictable CS is here!!!!!!!!!!!!!! > > Ah, addressing an issue I am still trying to understand! > > > After dozens of tests with the polarity switching scheme, if one knows > > the initial current at the beginning of the brew operation, then the > > cell current will follow a predictable curve and so will the PPM. > > Can you elaborate? Formula or charts? I'm new to this, so pardon if > the question is ignorant, but doesn't the the surface area of the > electrode in solution figure in? I would guess that the emitted silver > for any surface area could be normalized though (surface area * current > or something like this?). > > > I am ordering a few parts tomorrow to build the prototype, and > > everything you need to build it will be detailed by the end of next > > week. It will use a 555 timer and a new very low current DPDT relay. The > > timer and relay will be driven by 4 batteries of your choice AA, C, or > > D; two diode, four resistors, one electrolytic cap., a circuit board, > > plus several small connectors and battery box. You can package it anyway > > you want. > > I am assuming that the relay is for alternating the polarity to the > electrodes here (other than evening out the wear on the electrodes, is > there a point to this?). An "H Bridge" might be more efficient and less > succeptable to fail over time than a mechanical relay?! > > > This will put a stop to all of the questions as to why "my CS turns > > color," and what is my ppm. You really have to "screw-up"to get yellow. > > Again, I'm pretty new to this, is there a FAQ somewhere that might > explain why ending up with the yellow color is not a good thing? > > While I am still a long way from finalizing the design :-). I'm > thinking about a microcontroler that would deal with temperature of > solution (this seems like an important value in the equation) and > control of time, voltage (maybe) and current. Even with all I have read > on this to date, I don't see how one gets any degree of consistancy with > the methods and equipment that I've seen recommended / being used. > Granted, again, I am new to this. I do have some experience with > industrial process control and maybe I am trying to make this more > difficult than it need be, but I have a hearty respect for "making > medicine" that I am going to put into either myself or someone I care > about :-). I've seen the abandon with which the "conventional medicine > establishment" seems to dispense meds and the results :-(. Paranoid? > I'm not sure yet :-), further research is required :-). > > Thanks & take care, Vikki. > -- > Victoria Welch, WV9K, DoD#-13, Net/Sys/WebAdmin SeaStar.org, > vikki.oz.net > "Walking on water and developing software to specification are > easy as long as both are frozen" - Edward V. Berard. > Do not unto others, that which you would not have others do unto you. > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > > List maintainer: Mike Devour <[email protected]> -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
